Tkabber is a Free and Open Source client for the Jabber instant messaging system. It's writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS X and Windows 98/2000/XP).

There is a Fossil repository for Tkabber's development source code on Chiselapp.com hosting. Tkabber development code was initially hosted on JabberStudio's CVS, then on 16th August, 2006, it migrated to XMPP.ru's SVN, and finally on 22th March, 2015 it migrated to Fossil.